On 3/7/09 15:31, "Roger Deghetto" <[email protected]> wrote:
> i know if you take a radeon 9800 out of a g5 the one with dvi /adc ports you
> have to tape pins 3 and 11 to get it to work in a 4x g4 what id like to know
> does doing that disable the adc port in other words would i still be able to
> use my secondry adc display?
>
> thanks
> roger
I don't think a mac edition 9800 from a G5 will work in a G4 without
quite serious work - the pinouts were altered when the 8x agp spec came in.
In the 4x agp spec pins 3 and 11 were unused by the peecee folk but Apple
pinched them for the adc connection - so when the pins were claimed by the
8x spec Apple had to rearrange their adc connectors and remove them from the
main slot - called it agp pro. It effectively meant that no 8x capable card
could be used in a 2x/4x adc type slot - as the adc connections on 3 and 11
of the slot would prevent booting - see...
<http://themacelite.wikidot.com/pins-3-and-11>
I think the change to the adc connectors meant that a mac edition radeon
9800 from the G5 8x agp pro slot will not physically fit in the G4 older
type adc slot due to the changes. I do remember seeing an article about
adapting one but that was long ago. The taping of pins 3 and 11 is usually
used widely to put 8x capable flashed pc cards in an older 2x/4x slot.
Whilst the slot speed will stay the same - later gpu and memory
configurations are a hell of a lot faster...
Pete
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